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- W1968512108 abstract "A large-scale conformational change in genomic DNA is an essential feature of gene activation in living cells. Considerable effort has been applied to explain the mechanism in terms of key−lock interaction between sequence-specific regulatory proteins and DNA, in addition to the modification of DNA and histones such as methylation and acetylation. However, it is still unclear whether these mechanisms can explain the ON/OFF switching of a large number of genes that accompanies differentiation, carcinogenesis, etc. In this study, using single-molecule observation of DNA molecules by fluorescence microscopy with the addition of poly-l-lysine with different numbers of monomer units (n = 3, 5, 9, and 92), we found that an ON/OFF discrete transition in the higher-order structure of long duplex DNA is induced by short poly-l-lysine, whereas a continuous gradual change is induced by long poly-l-lysine. On the other hand, polycations with a lower positive charge have less potential to induce DNA compaction. Such a drastic difference in the conformational transition of a giant DNA between short and large oligomers is discussed in relation to the mechanisms of gene regulation in a living cell." @default.
- W1968512108 created "2016-06-24" @default.
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- W1968512108 date "2006-11-29" @default.
- W1968512108 modified "2023-09-30" @default.
- W1968512108 title "Weak Interaction Induces an ON/OFF Switch, whereas Strong Interaction Causes Gradual Change: Folding Transition of a Long Duplex DNA Chain by Poly-<scp>l</scp>-lysine" @default.
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- W1968512108 doi "https://doi.org/10.1021/bm060634j" @default.
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